Resilient wheel.



J. EDMAN.

RESILIENT WHEEL.

APPLIOATION FILED FEB.21,1908.

Patented Aug. 31, 1909.

'UNfl'TEl-)- STATES PATENT OFFICE.

JOHN EDMAN, 0F MINNEAPOLIS, MINNESOTA, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS,

0F TWO-THIRD'S T0 ALFRED M. HOVLAND AND ONE-THIRD TO OLE N. NELSON, BOTH OF MIN- NEAPOLIS, MINNESOTA.

RESILIENT Application filed February 21, 1908. Serial No. 417,008.

To all whom it may concern:

Be it known that. I, Jon-N EDMAN, a

citizen of the United Statcsfresiding at,

Minneapolis, in the county of llennepin and State of Minnesota, have invented certain new and useful Improvements in Resilient. Wheels; and I do hereby declare the following to-be a full, clear, and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

My invention relates to resilient wheels and has for its especial object to provide iniproved means for preventing puncturing of a pneumatic tire, while preserving the resilience of the wheel, due to the use thereof.

.To the above ends the invention" consists of the novel devices and combinations of devices hereinafter described and defined inthe claim.

The invention is illustrated in the'accompanying drawings, wherein like characters indicate like parts throughout the several views.

Referring to the drawings, Figure 1 is a fragmentary view in side elevation, showing:

a wheel constructed in accordance with my invention. Fig; 2 is a transverse section taken on the liner :0 of Fig. 1. Fig. 3 is a plan-view of a portion of, the rim; and Fig. 4 is a detail, with parts broken away, taken in transverse section on the line a3 a1 numeral 2 the spokes of the wheel.

The wheel rim proper is made up of annular metallic plates 3 -4 that are reversely bulged outward in cross section to form an endless channel 5 adapted to receivea pneumatic' tire 6. The inner flanges of the rim sections 3 and 4 are preferably formed with an overlapping joint, and they are also formed with seats that receive and closely fit the ends of the wheel spokes 2. The flange of the rim section 3 is rigidly secured to the ends of the spokes, as shown, by screws 7., while the rim section 4 is detachably connected to the said rim section 3 and- 6o\to the said spokes. This detachable connection is preferably accomplished'by headed studs orscrews 8 that are rigidly secured to the inner flange of the rim section 3 and are projected freely'through the perforations 9 of the inner flange of the rim section 4.

that they permit. the heads of the studs 6" to freely pass theretl'irough. A lock ring It) is seated against the 'onter face of the inner flange of the rim section -t and is provided with lock slots 11 having enlarged ends 12, through which the heads-of the studs 8 are adapted to be freely passed. When this ring is turned so that the slots 11 engage under the heads of the studs 8, the two sections of the wheel rim are locked together as shown in the drawings, but when the said lock ring is turned so that the enlargements 12 are alined with the heads of the studs 8 the said lock ring may be moved laterally from working position, thereby releasii'igthe rimsection 4 so that the latter may also be moved laterally off from the studs 8 and from working position. The

, outer flanges of the rim sections 3 and 4 are parallel and their inner faces are, as shown,

formed with radial spacing and guiding grooves 13.

The wheel tread is formed from a single continuous piece 14 of solid rubber, as shown formed rectangular in cross section and arranged to fit between the outer flanges of the rim sections 3 and 4 and to bear against the outer portion of the pneumatic tube 6. To prevent creeping or circumferential movement of the tread rim 14 it is provided, on its side faces, with integral guide lugs or bosses '14 of substantially rectangular form that work in the radial grooves 13 of the rim sections3 and 4. To hold the lock ring 10 in its operative position shown in Fig. 1, a pin or split key 15 may be passed Specification Letters Patent Patented Aug. 31, 1905);

through co-incident perforations in the said ring and in the inner flange of the rim. sections 3 and 4. This tread piece 14 in itself has considerable elasticity and, hence, cushioning action, but. the main cushioning action will be taken by the inflated pneumatic .tube 6. The distance between the inner faces of the outer flanges is less than that between the bulged portions of the rim sec tions. The pneumatic tube 6 has a certain amount of side clearance in the channel 5', as

' shown in Fig. 2, and the flat inner face. of-

4 of the wheel rim are locked together, the

great resilience and durability.

pneumatic tube or inner cushioning tube and the outer yielding tread section are sccurely held in Working position in such manner that they can not he accidentally displaced, but at the same time are capable of such movements as are required to give resilience to the wheel. The resilient or yielding tread forms such close joints with the rim sections 25 and 4 that dirt cannot get into the annular seat which contains the pneumatic tire. VJhcn the lock ring ll) is removed from the headed studs 8 the dc laolnlble rim section l may also be removed laterally front working position thus making it an easy nmlter to either ren'iovethe pneumatic tube and trend from working positions or to place the same in working positions. I

As is evident, the construction above described affords a pneumatic Wheel having its the so protected that it cannot be punctured by anything over which the Wheel may run and, at the same time, gives a Wheel having V-Zhat' I claim is: In a resilient Wheel, the combination of rim sections arranged side by siderand 'sev cured together, said sections being provided with intermediate outwardly I bulged porlions forming between them a channel, par-,

' of clearance therein, and a solid tread-piece of rectangular cross section having guide lugs or bosses formed integral therewith at its side faces and engaging the grooves oi the flanges in order to guide said head piece freely in inward and outward direction, said tread-piece having its side faces located within the channel in close proximity to the inner faces of said flanges and resting directly at its inner face on the pneumatic'tube.

In testimony whereof I aflix my signature in presence of two Witnesses.

JOHN EDMAN.

Witnesses H. D. KiLoonn, F. D. MERC-IIAN'I. 

